Display screen with transitional keyboard user interface



FIG. 1 is a front view of the first image of a display screen with a transitional keyboard user interface; and,

FIG. 2 is a front view of a second image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-2. The process or period in which an image transitions to another forms no part of the claimed design. The broken line showing of a display screen and graphic elements form no part of the claimed design. 

The ornamental design for a display screen with transitional keyboard user interface, as shown and described. 